package com.y2.authprj.utils;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieUtil {

    		/**  
             * 读取所有cookie  
             * 注意二、从客户端读取Cookie时，包括maxAge在内的其他属性都是不可读的，也不会被提交。浏览器提交Cookie时只会提交name与value属性。maxAge属性只被浏览器用来判断Cookie是否过期  
             * @param request  
             * @param response  
             */  
            public void showCookies(HttpServletRequest request,HttpServletResponse response ){  
                   
                Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组  
                if (null==cookies) {  
                    System.out.println("没有cookie=========");  
                } else {  
                    for(Cookie cookie : cookies){  
                        System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());  
                    }  
                }  
                   
            }  
            /**  
             * 添加cookie  
             * @param response  
             * @param name  
             * @param value  
             */    
            public void addCookie(HttpServletResponse response,String name,String value){  
                Cookie cookie = new Cookie(name.trim(), value.trim());  
                cookie.setMaxAge(30 * 60);// 设置为30min  
                cookie.setPath("/");  
                System.out.println("已添加===============");  
                response.addCookie(cookie);  
            }  
            /**  
             * 修改cookie  
             * @param request  
             * @param response  
             * @param name  
             * @param value  
             * 注意一、修改、删除Cookie时，新建的Cookie除value、maxAge之外的所有属性，例如name、path、domain等，都要与原Cookie完全一样。否则，浏览器将视为两个不同的Cookie不予覆盖，导致修改、删除失败。  
             */   
            public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){  
                Cookie[] cookies = request.getCookies();  
                if (null==cookies) {  
                    System.out.println("没有cookie==============");  
                } else {  
                    for(Cookie cookie : cookies){  
                        if(cookie.getName().equals(name)){  
                            System.out.println("原值为:"+cookie.getValue());  
                            cookie.setValue(value);  
                            cookie.setPath("/");  
                            cookie.setMaxAge(30 * 60);// 设置为30min  
                            System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());  
                            response.addCookie(cookie);  
                            break;  
                        }  
                    }  
                }  
                   
            }  
            /**  
             * 删除cookie  
             * @param request  
             * @param response  
             * @param name  
             */      
            public void delCookie(HttpServletRequest request,HttpServletResponse response,String name){  
                Cookie[] cookies = request.getCookies();  
                if (null==cookies) {  
                    System.out.println("没有cookie==============");  
                } else {  
                    for(Cookie cookie : cookies){  
                        if(cookie.getName().equals(name)){  
                            cookie.setValue(null);  
                            cookie.setMaxAge(0);// 立即销毁cookie  
                            cookie.setPath("/");  
                            System.out.println("被删除的cookie名字为:"+cookie.getName());  
                            response.addCookie(cookie);  
                            break;  
                        }  
                    }  
                }  
            }
            /**  
             * 根据名字获取cookie  
             * @param request  
             * @param name cookie名字  
             * @return  
             */  
            public Cookie getCookieByName(HttpServletRequest request,String name){  
                Map<String,Cookie> cookieMap = ReadCookieMap(request);  
                if(cookieMap.containsKey(name)){  
                    Cookie cookie = (Cookie)cookieMap.get(name);  
                    return cookie;  
                }else{  
                    return null;  
                }     
            }  
                
                
                
            /**  
             * 将cookie封装到Map里面  
             * @param request  
             * @return  
             */  
            private Map<String,Cookie> ReadCookieMap(HttpServletRequest request){    
                Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();  
                Cookie[] cookies = request.getCookies();  
                if(null!=cookies){  
                    for(Cookie cookie : cookies){  
                        cookieMap.put(cookie.getName(), cookie);  
                    }  
                }  
                return cookieMap;  
            }         
            
            
}
